so in the woods its like a 2 stroke.......ok in 2000 i had a banshee .....no low end power......not very trail friendly or friendly at alot of other things hehehe.....how bout changing sprockets to help out in the trails??? sorry bout all the ?s this is going to be my first HONDA owned and since i cant test ride the 450 its making me crazy......im 195 lbs and i just dont want to get the ex and say man i should have gotten the 450.....but i guess with a pipe and jet kit the 400 would be good......ohhhh close your ears... the only bike ive ever owned with rev was a raptor 660.....so no biggie on rev...If you are doing real tight trails I would go with the 400. Like 69 said, the 450 cannot be lugged down like the 400. The 450 works just fine in the trails but clutch work is a must. You almost have to ride it like a 2 stroke.
You have a 38 on the rear get a 39 and that will help a lot going to loose some top end but will have good bottom and keep the 13 on the front.I tried a front sprocket from a "R" dirt bike, 1 tooth smaller I think, and it geared down too much. Maybe going up on the rear would have been better. I just learned to like the 450 in the woods. The 450 is lighter and more nimble, a trade you have to accept for the lack of low end power. If you get one with kick start, it will be a PITA when you stall-out off camber.
Don't ever hook up with your utility bike brothers for a trail ride, you will be pulling out your hair 2 turns down the trail. Their 3rd gear cruising is somewhere in between 1st and 2nd for the 450R.